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Posted by PaulHoule 6/26/2025

Ultrasound toothbrush promises painless checks for hidden gum problems(phys.org)
69 points | 36 comments
wjnc 4 days ago|
First law of dentistry: Any innovation that does not increase dentist margin, will not reach market.

To expand on this argument. I think even medical health care is more open to innovation that mainly benefits consumer health. Doctors are kind of oblivious of the cost of procedures. This has a host of other problems, but at least innovation and health outcomes are aligned (and less aligned with cost). Dentists are massively private equity owned where I live. Bottom line is everything. You notice that where you’re in the chair. Six minute procedures (the billing time) always take seven. Kids are state insured and always get upsold to whatever procedure is fashionable (or should I say: has the highest margin). I have a strong feeling innovations are swallowed up and shelved in this sector. It makes sense for the PE to kill innovation once you have a market cornered.

The only thing this anti market rant (not my usual spiel) does not have is an explanation for how PE coordinates the suppression of innovation. I should look into the owners of the parties that deliver the dentist supplies and machinery. That would be the best way to corner a market, by owning the supply chain as well.

TheJoeMan 4 days ago||
I understand the negative outlook, but consider that this invention, being less-invasive, could be a draw to some patients. With the saturation of dental offices, some are trying to position themselves as higher-end "spas" with gentle-touch services and/or for people with sensory issues. So it's not just margin, it can also be market-share oriented.
1970-01-01 4 days ago|||
I would not be too sure of this with current administration upheaval. The health system is broken in bad and good ways now. If you build it, it can succeed much to the chagrin of well paid dental 'experts'
ErrorNoBrain 4 days ago|||
this is just a product that is easier to use?

i dont see why it couldnt reach the market

jampekka 4 days ago|||
My favorite conspiracy theory stuff are the multiple unused caries vaccine patents by the dental care industry.
foolswisdom 4 days ago||
Do you mind picking to some of these? I did a quick Google patents search but didn't find anything.
jampekka 4 days ago||
Colgate Palmolive 1973: https://patents.google.com/patent/US3931398A/en

Merck & Co 1979: https://patents.google.com/patent/US4287173A/en

Lion Corp 1983: https://patents.google.com/patent/US4693888A/en

In all likelihood these just didn't work, but the commercial interest to not have caries immunization is just too juicy not to theorize!

eru 4 days ago||
Interesting, all of the ones you cite are older than 20 years, so the patents should have long expired and should be free for anyone to bring to market?
lofaszvanitt 4 days ago|||
I think most of the people do not even know how much calcium or other supplements they need on a daily or weekly basis to keep their teeth healthy.
amelius 4 days ago||
Can you point to the research?
lofaszvanitt 4 days ago||
Reading comprehension? "I think..."
throwaway290 4 days ago|||
Fluoride based toothpaste does not increase dentist margin though right?

> toothpaste is usually self-administered haha

very funny. this is a toothbrush, unless you have someone brush your teeth it is always self administered

breezeTrowel 4 days ago|||
Despite the headline, this is not a toothbrush. This is a "toothbrush-shaped ultrasound transducer". Mind you, I don't know why this wouldn't "increase dentist margin". This is an analysis tool that makes dentistry easier (just like dental X-rays).
wjnc 4 days ago||||
First introduced in 1914! Suppressing a current practice is way harder than suppressing an innovation via buy-and-die.
throwaway290 4 days ago||
True.
ceejayoz 4 days ago||||
> Fluoride based toothpaste does not increase dentist margin though right?

I mean, that's under attack now.

https://www.npr.org/2025/04/10/g-s1-59452/hhs-rfk-fluoride-d...

"The Department of Health and Human Services is directing the Centers for Disease Control and Prevention to make new recommendations on the addition of fluoride to U.S. water sources. HHS Secretary Robert F. Kennedy Jr. has blamed the fluoridation of water for a number of health problems."

MyOutfitIsVague 4 days ago||
I don't care for the current admin nor RFK Jr, but this is a bit disingenuous. Floride toothpaste and floridated drinking water are different things, and RFK hasn't said anything about attacking the former. This jab doesn't have anything to do with the discussion at hand.
ceejayoz 4 days ago||
Fearmongering about fluoride is unlikely to stop at the water supply.

RFK has already made moves in this direction: https://www.pbs.org/newshour/health/fda-and-rfk-jr-aim-to-re...

> The products targeted by the FDA are sometimes recommended for children and teens who are at increased risk of tooth decay or cavities because of low fluoride in their local drinking water. They usually require a prescription from a pediatrician or dentist. Fluoride-based tablets and lozenges are designed to be chewed or swallowed. Companies also sell drops for babies and infants.

And other politicians:

> Last week, Texas Attorney General Ken Paxton announced an investigation into the marketing of fluoride toothpastes by Colgate-Palmolive and Proctor and Gamble. A press release from his office described the companies’ promotions as “misleading, deceptive and dangerous.”

throawayonthe 4 days ago||||
toothpaste is usually self-administered haha
amelius 4 days ago||
This could be an innovation: toothbrush with built-in toothpaste dispenser.
meindnoch 4 days ago|||
From 2011: https://techcrunch.com/2011/03/22/actually-a-good-idea-tooth...
amelius 4 days ago||
Nice find. However, I'm using an electric toothbrush. And the dispensing could be more automatic.
Someone 4 days ago|||
Already a product, typically/always marketed as a travel toothbrush.
yanko 4 days ago|||
Fluoride as ingredient is questionable for human heath despite of what the marketing spread
OKRainbowKid 4 days ago||
Do you have any reputable evidence that fluorinated toothpaste is harmful (assuming normal usage)?
infecto 4 days ago||
I am a big believer in this. Dentistry is one of the largest grifts in modern medicine, I would put it up there with Chiropractors. Go see 5 dentists and you will get 5 wildly different opinions. I am certain there are good ones out there but it’s way too hard to evaluate.

Unlike other areas of medicine it’s also one of those frustrating areas because there are interesting devices, pastes and tools that should be easy to purchase but are locked behind the gates of a prescription.

cyberax 4 days ago||
> Unlike other areas of medicine it’s also one of those frustrating areas because there are interesting devices, pastes and tools that should be easy to purchase but are locked behind the gates of a prescription.

I have had a lot of dental work done, including 4 implants. But I don't remember a _single_ dental prescription-only item.

infecto 4 days ago|||
Since you have never experienced it, it therefore does not exist.

I have purchased specific pastes from Japan that are OTC there but not in the states, prescription only. I also use a dental appliance at night mid 4 figure costs, it’s 3d printed, the office uses a scanner to create the cad or equivalent to print. Very little hands on but huge margins. Very hard to to find a doctor using a brand I like and even then the dentist does little to nothing in the whole process.

Clamchop 4 days ago|||
I've had at least three prescription dental products: Fluoride lacquers (can cause fluorosis supposedly so not without risk), chlorhexidine antiseptic mouth rinse, 3M Clinpro 5000 toothpaste (high fluoride again).

I've had only a quarter as many implants so I guess it just depends.

eminemence 4 days ago||
Check this : https://pmc.ncbi.nlm.nih.gov/articles/PMC4252862/ This is a flouride alternative and seems to help teeth recover faster.
poulpy123 4 days ago||
It's..it's not a toothbrush
aaron695 4 days ago||
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grego 4 days ago|
In Finland there is a profession called dental hygienist, whom I visit once a year. They clean up my teeth with an ultrasound device since many years, removing tartar.

I would not call it exactly painless though.

inkcapmushroom 4 days ago||
That's called an ultrasonic scaler, which is quite different to the device in the article. A scaler is for removing tartar and stain while the device in the article is an ultrasound (like the device for viewing babies during pregnancy) which looks under your gums at your tooth roots and bones to see if you have any bone loss or gum disease.

You might not have the dentist or dental hygienist use the probe very often. When they do it's a rounded straight tip device, and they usually call out numbers to an assistant for how deep under the gumline the probe can reach. That's the procedure this device would replace. If nothing else it's an improvement because you don't need an assistant to record the numbers, and if someone has bad gum disease it might hurt them when you poke in there with a probe.

leviathant 4 days ago|||
I went 14 years between dental visits, and the move to ultrasound cleaning was the biggest change I noticed. The cleaning had always been a bloody affair, scraping and scratching in a way that would leave me with a throbbing pain after my appointment was ove. The ultrasound cleaning was like science fiction.
neilv 4 days ago|||
Has anyone else found an ultrasonic scaler very loud while in use, and to cause tinnitus for a couple days after?
bluGill 4 days ago||
In the US most visit that person twice a year. They have that ultrasound machine, but they only use it on people who don't visit that often - the machine just gets the build up do the point where manual tools can finish the job. If you brush/floss and visit regularly the manual tools are all they need.

In this was at least it looks like the US system is better. Of course there is no way nuance can be expressed in a short forum like this, but maybe you need to look at the Finland system to see if it is really good enough.